Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task.

Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Research Abstract Details 

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Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Abstract Text:

John R Monterosso,George Ainslie,Jiansong Xu,Xochitl Cordova,Catherine P Domier,Edythe D London,

Relative to individuals who do not have addictive disorders, drug abusers exhibit greater devaluation of rewards as a function of their delay ("delay discounting"). The present study sought to extend this finding to methamphetamine (MA) abusers and to help understand its neural basis. MA abusers (n = 12) and control subjects who did not use illicit drugs (n = 17) participated in tests of delay discounting with hypothetical money rewards. We then used a derived estimate of each individual's delay discounting to generate a functional magnetic resonance imaging probe task consisting of three conditions: "hard choices," requiring selections between "smaller, sooner" and "larger, later" alternatives that were similarly valued given the individual's delay discounting; "easy choices," in which alternatives differed dramatically in value; and a "no choice" control condition. MA abusers exhibited more delay discounting than control subjects (P < 0.05). Across groups, the "hard choice > no choice" contrast revealed significant effects in the ventrolateral prefrontal cortex, dorsolateral prefrontal cortex (DLPFC), dorsal anterior cingulate cortex, and areas surrounding the intraparietal sulcus (IPS). With group comparisons limited to these clusters, the "hard choice > easy choice" contrast indicated significant group differences in task-related activity within the left DLPFC and right IPS; qualitatively similar nonsignificant effects were present in the other clusters tested. Whereas control subjects showed less recruitment associated with easy than with hard choices, MA abusers generally did not. Correlational analysis did not indicate a relationship between this anomaly in frontoparietal recruitment and greater degree of delay discounting exhibited by MA abusers. Therefore, while apparent inefficiency of cortical processing related to decision-making in MA abusers may contribute to the neural basis of enhanced delay discounting by this population, other factors remain to be identified.

Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Publishing Authors By Initials

JR Monterosso,G Ainslie,J Xu,X Cordova,CP Domier,ED London,

For similar psychological phenomena and processes: mental processes: learning: reinforcement (psychology): reward research abstracts see: psychological phenomena and processes: mental processes: learning: reinforcement (psychology): reward research

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Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Human brain mapping

VOLUME: 28

Page Numbers: 383-93

Journal Abbreviation:

ISSN: 1065-9471

DAY: 3

MONTH: May

YEAR: 2007

Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9419065

Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Keywords Mesh Terms:

KEYWORDS: Reward

MESH TERMS: blood

Chemical & Substance for Abstract: Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task. Information

Substance Name: Oxygen

Registry Number: 7782-44-7

Grant and Affiliation Information for Frontoparietal cortical activity of methamphetamine-dependent and comparison subjects performing a delay discounting task.

AFFILIATION: Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, California 90024, USA. jmont@ucla.edu

Country: United States

AGENCY: United States NCRR

GRANT: P20RR020750

ACRONYM: RR

MEDLINETA: Hum Brain Mapp

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